Language being a tool of expression which can often avoid physical violence. Casual usage dillutes the intended effect, thereby increasing the likelihood of physical altercation as a form of expression for emotion.
Those who use said verbal profanity in a casual manner simply to appear cool or rebelious are a complete bore, as in doing so, they only indicate their own lack of social awareness and constructs.
At the same time, I personally glorify jubilently when somebody who has truly reached the end of their rope, unleashes with a stream of expletives as a way of showing just how long they have been bottling up their true emotions. These words become a needed, clear, and very naked form of expression noticed by everyone, provided it is sincere of course.
Just a personal pet issue splinter deviation from your more general idea.
Girls who engage in casual cursing can turn my gaze away instantly by doing so:p